What do tick marks on a navigation chart represent?

Tick marks on a navigation chart represent the divisions of degrees of latitude and longitude, often indicating minutes. Each degree of geographic coordinate is further divided into 60 minutes, which help pilots accurately identify their position and navigate appropriately. This is essential for flight planning and ensuring precise course adjustments during flight. By using tick marks, pilots can easily visualize the specific distances represented on the chart, enhancing their ability to maintain situational awareness and navigate effectively.

The other options do not accurately describe the function of tick marks. Safe flying altitudes are represented in different ways on charts, typically with altitude information rather than tick marks. Flight distance to a destination might be indicated by other markings or scales rather than tick marks. Weather patterns are usually shown through specific symbols and color coding on charts, not through tick marks.